1968. Revised edition. 109 pages. This is an ex-Library book. Pictorial dust jacket over green cloth. Ex library copy with associated labels, inserts, stamps and annotations. Pages with some foxing and tanning, particularly to endpapers and textblock edges. Binding remains firm. Boards have mild shelf wear with light rubbing and corner bumping. Some mild marking and tanning. Boards are slightly bowed. Unclipped jacket has light edge wear with minor chipping and creasing.